Search for: [References = %22van Houtum H.%2C 1999%2C Internationalisation and mental borders%2C Tijdschrift voor Economische en Sociale Geografie%2C 90%2C 3%2C s. 329%5C-335. https%5C:%5C%2F%5C%2Fdoi.org%5C%2F10.1111%5C%2F1467%5C-9663.00074%22]

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